Lightning-arrester.



PATENTED MAY9, 1905.

H. R. SARGEN'T.

LIGHTNING ARRESTER.

APPLICATION FILED AUG. 28, 1902.

Fig.2,

lNvENTon 1 Howard Rsargenc. W may NI STATES Patented May 9, 1905.

HOW'ARD R. SARGENT, OF SOHENEOTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEIV YORK.

LlGHTNING-ARRESTER.

SPECIFICATION forming part of Letters Patent No. 789,458, dated May 9, 1905.

Application filed August 28,1902. Serial No. 121,286.

To all 11/71/0112 it ntrzy concern:

Be it known that I, HOWARD R. SARGENT, a citizen of'the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Lightning Ari-esters, of which the following is a specification.

This invention relates to lightning-arrest ers, and especially to those adapted for alternating-cu rrent work.

The particular type of lightning-arrester to which the invention applies is that shown, for instance, in the patent of H. O. Wirt, No. 669,155, dated March 5, 1901, in which the spark-gap is formed by two or more metallic cylinders or dischargers placed within arcing distance of each other and of considerable surface area, so that they will remain cool and prevent the formation of conducting-gases, which would tend to maintain the are. In series with the cylinders is a non-inductive low resistance-as, for example, a rod of graphite.

The object of my invention is to combine in one structure the spark-gap cylinders or dischargers and the non-inductive resistance in order to reduce the size and the cost of the lightning-arrester. I accomplish this by using dischargers of graphite, carbon, or some other high-resistance material, such as carborundum mixed with clay in certain proportions. These dischargers are molded of any desired size and are arranged within arcing distance of each other and connected with suitable line-terminals.

In the accompanying drawings, Figure 1 is a side elevation of a lightning-arrester embodying my invention. Fig.2 is a top plan view of the same.

The dischargers I are composed of carbon or graphite or carborundum mixed with clay or some other suitable high-resistance material. They are preferably molded in order to insure uniformity of size and a smooth periphery, being preferably of cylindrical form, as shown. They are then mounted within arcing distance of each other on a suitable insulating-base 2 and secured thereto in any suitable manner, as by means of screws 3 passing axially through said cylin ders into said base. Binding-posts 4 are attached to said base and are connected, as by means of metallic strips 5, with the respective dischargers if there are only two or with the dischargers at the ends of the series if more than two dischargers are used.

If desired, the dischargers may be plated with metal or may have metal strips inserted therein, as indicated in dotted lines in Fig. 2, to form arcing-surfaces at the gaps.

It will be seen that a lightning-arrester thus constructed is capable of performing the functions of a lightning arrester composed of metal dischargers and a rod of non-inductive resistance material and that it is far more compact and more simple in construction.

\Vhat I claim as new, and desire to secure by Letters Patent of the UnitedStates, is

1. A lightning-arrester consisting of cylindrical dischargers arranged within arcing dis tance of each other and with their axes parallel, said dischargers being formed of carbonaceous material mixed in suitable proportion with non-conducting material.

2. A lightning-arrester consisting of cylindrical dischargers arranged within arcing distance of each other and with their axes parallel, said dischargers being formed of a mixture of carbon and clay.

In witness whereof I have hereunto set my hand this 26th day of August, 1902.

IIOIVARI) R. SARGENT.

Witnesses:

BENJAMIN B. I'IULL, Josnrn: A. L. Ennaes. 

